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MEDIAN

Section: User Commands (1)
Updated: 16 Mar 1998
Index

 

NAME

median - noise reduction filtering

 

SYNTAX

 median [-frac <fractile>] [-mask <maskfile>] [-mirror]
         <inimage> <outimage> [<dx> [<dy>]]

 

DESCRIPTION

Median/fractal noise filtering with window dx* dy.For images with pixel type unsigned byte, the histogramupdate technique is used.

Default values for dxis 3, for dyit is dx.

 

OPTIONS

-frac fractile

fractiledetermines which output pixel is chosen from thedx* dywindow. fractileequal to 0.5 gives the median,fractileequal to 0.0 gives the minimum, fractileequalto 1.0 gives the maximum. Default: 0.5 (median).

-mask maskfile

Read a mask from an ascii file rather than using a rectangleof size dx* dy.

-mirror

Mirror the mask before using it.

 

REFERENCE

Huang, Yang and Tang:"A Fast Two-Dimensional Median Filtering Algorithm"IEEE Trans. Ac., Speech, and Signal Proc, Vol ASSP-27,No.1, Feb.1979

 

SEE ALSO

pseudomedian3x3(1)

 

AUTHOR

Tor Lřnnestad and Otto Milvang, BLAB, Ifi, Uio

 

EXAMPLES

 median mona.img monaMed.img
 median mona.img monaMed.img 7
 median mona.img monaMed.img 7 5
 median -f 0.25 -m filter.msk mona.img mona.25.img

 filter.msk:
 #
 # Filter for mona
 $size 5 5
 0 1 1 1 0
 1 1 1 1 1
 1 1 2 1 1     ; count the center pixel twice
 1 1 1 1 1
 0 1 1 1 0

 

ID

$Id: median.c,v 1.23 1997/03/07 12:52:09 svein Exp $

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Index

NAME

SYNTAX

DESCRIPTION

OPTIONS

REFERENCE

SEE ALSO

AUTHOR

EXAMPLES

ID

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